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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 01-26-09, 12:52 PM   #1
omegamars
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Any remedy for bumpy tires?

When i try ride my bike my rear wheel keeps bumping can't even gain speed as it'll get really uncomfortable. i'm looking for a solution but i'm a noob when it comes to repairing bikes so hopefully one of you guys can help me

Thanks in advance
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Old 01-26-09, 01:24 PM   #2
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1.Check that The wheel (axle part) is set properly into the frame (straight, even and tight).
2.Check that the tire is seated properly on the rim by letting most of the air out and inspect.
3.Have your wheel trued by your local bikeshop.
4.Buy a new wheel and/or/tire/innertube.
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Old 01-26-09, 02:06 PM   #3
tFUnK
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1) what crawdaddio said
2) wrong forum - try bicycle mechanics for real advice without fixter sarcasm
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Old 01-26-09, 02:13 PM   #4
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What's it rubbing against? Your brakes or your frame?
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Old 01-26-09, 03:44 PM   #5
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Originally Posted by omegamars View Post
When i try ride my bike my rear wheel keeps bumping can't even gain speed as it'll get really uncomfortable. i'm looking for a solution but i'm a noob when it comes to repairing bikes so hopefully one of you guys can help me

Thanks in advance
Sounds like it's out of true. Since you are a self-declared noob then take it to a bike shop. You will likely do more harm than good by trying to true it yourself.
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Old 01-26-09, 04:11 PM   #6
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This is a good opportunity to develope some diagnostic skill. Stand it upside down or put it on a stand or rack, spin the wheel and observe the rim and tire as they rotate past a fixed spot, like a brake pad. It should spin smoothly with no side to side motion. If it is out of true the rim will seem to move closer to and farther away from the brake pad as it goes around. That should be fixed by a bike shop. If the tire is not seated right there will be a bulge or flat spot somewhere in the circumference. That might be fixed by deflating and reinflating the tire. It there is a bump in the tire right by the valve stem, you may have trapped the reinforced part of the tube around the base of the valve stem under the tire rim. Deflate the tire, push the valve stem well into the tire, then pull back out. Also grab the wheel and see if it rocks side to side more than a millimetre. In that case the axle cones need to be adjusted. Also check that it is firmly bolted into the dropouts. Also make sure no other part of the bike like the rear triangles of the frame are broken.

You posted in the fixed gear forum, but if it is not a fixed gear bike and has a rear gear cassette, it is normal to see a little irregular oscillation in the cassette as the rear wheel spins.

Last edited by cooker; 01-26-09 at 04:20 PM.
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Old 01-26-09, 09:13 PM   #7
omegamars
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cool thanks guys for the help and sorry i posted in the wrong forum,

'If the tire is not seated right there will be a bulge or flat spot somewhere in the circumference. That might be fixed by deflating and reinflating the tire'

I think it might be this i'm looking at the wheel right now and there is a part that is in deeper then the rest.

also when pressing on the tire, am i supposed to feel the valve?
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Old 01-26-09, 09:30 PM   #8
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also when pressing on the tire, am i supposed to feel the valve?
that doesn't sound right.
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Old 01-26-09, 09:33 PM   #9
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I think you just have a bulge in your tube. You get them by over-inflating, by mis-mounting, or often tubes just come bunk.
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Old 01-26-09, 09:52 PM   #10
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with no air in the tube but ready to inflate, push the valve stem outward a bit so it clears the bead of the tire, make sure the tire is seated evenly all the way around, then inflate it.........sometimes if a tire has been folded or stored a long time it won't want to cooperate, in that case put a little air in then make sure its seated before inflating it fully. Put presta valve nut on last(if you put one on), after inflating tire.

its real easy to get it pinched in there and then when you do put air in it will cause a bulge at the valve stem
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